Giannis is the 4th best player in the NBA (IMO) behind only James, Curry, and Durant. I'd listen to arguments on Harden, Davis, Westbrook, and a healthy Leonard, but that is it.
In the 2 playoff games, Giannis is averaging 32.5/11/7.5 with 2 steals and is shooting 63.2% from the field. There isn't a whole lot more he can do, the Bucks just aren't a very well constructed team and Joe Prunty is in way over his head.